Problem:
I have Nvidia problems I don't know what happen because when I run WarCraft with optirun it display errors then if I type optirun glxgears, it displays the same errors as when im running warcraft ..

optirun glxgears
[ 25.424416] [ERROR]The Bumblebee daemon has not been started yet or the socket path /var/run/bumblebee.socket was incorrect.
[ 25.424460] [ERROR]Could not connect to bumblebee daemon - is it running?

Note: I already had Bumblebee installed. It worked before, but all of a sudden my laptop suddenly doesn't recognize my VGA..

New questions

Why did my initial problem arise? Is it because I used ctrl + alt + sys req + REIUSB ?? Yes i typed it REIUSB and not REISUB..

Why did my solution work?

I already searched in google and didnt find any good/clear answer(the answers too hard for newbie to understand) please answer with details because im a newbie in ubuntu and also in computer .. i just installed ubuntu 2 weeks ago so i can learn about computer.

It think you are using a Optimus compatible VGA (A computer with an Intel and a NVidia VGA Card) Optimus switchs between that two VGAs when you play games and programs with high need of Graphical process . Bumblebee is a free and Open-source implementation of Optimus technology , It think you should download and install it .
–
Mahyar PasarzangeneJan 3 '13 at 19:15